The SAS kills eight Provisional Irish Republican Army volunteers and a civilian during an ambush in Loughgall, Northern Ireland.

The Special Air Service (SAS) is a special forces unit of the British Army. It was founded as a regiment in 1941 by David Stirling, and in 1950 it was reconstituted as a corps. The unit specialises in a number of roles including counter-terrorism, hostage rescue, direct action and special reconnaissance. Much of the information about the SAS is highly classified, and the unit is not commented on by either the British government or the Ministry of Defence due to the secrecy and sensitivity of its operations.

The Provisional Irish Republican Army, officially known as the Irish Republican Army and informally known as the Provos, was an Irish republican paramilitary force that sought to end British rule in Northern Ireland, facilitate Irish reunification and bring about an independent republic encompassing all of Ireland. It was the most active republican paramilitary group during the Troubles. It argued that the all-island Irish Republic continued to exist, and it saw itself as that state's army, the sole legitimate successor to the original IRA from the Irish War of Independence. It was designated a terrorist organisation in the United Kingdom and an unlawful organisation in the Republic of Ireland, both of whose authority it rejected.

The Loughgall ambush took place on 8 May 1987 in the village of Loughgall, County Armagh, Northern Ireland. An eight-man unit of the Provisional Irish Republican Army (IRA) launched an attack on the Royal Ulster Constabulary (RUC) base in the village. An IRA member drove a digger with a bomb in its bucket through the perimeter fence, while the rest of the unit arrived in a van and fired on the building. The bomb exploded and destroyed almost half of the base. Soldiers from the British Army's Special Air Service (SAS) then returned fire both from within the base and from hidden positions around it in a pre-planned ambush, killing all of the attackers. Two of them were subsequently found to have been unarmed when they were killed.